Boost Mobile / my cell # was hijacked

On 2/14/18 I went to my local Boost Mobile store to switch from sprint to boost the young lady in the store switched my number prior to telling me there was an $80.00 transfer fee. When I told her I did not have that right now she basically said too bad we have your # now and will not release it until you pay us $80.00 this is a basic form of extortion. I want my # switched back to sprint had I been told all the details up front I would have never allowed my number to be transferred. My Name is Erica Muns my Cell # is [protected]. I hope you can resolve this issue since my # is being held hostage by Boost you can call my fathers # [protected].